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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efe4d5e194da39104465faa2b7585b4dbbcb9dcd557bc51b0f900e34d6fd72d' 
  AND token = 'e0zWEkXCG+Y7TUfcswgJj09zVrDPo/8a+T4+8pc5efA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}