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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c050de155baeb927ee20fda4a36b910b0f3a9e13eca0ebe4894418e332c9c4e' 
  AND token = 'W8ilNFoZZrIZ4461LIoCJA70Y3GnpL9/8/B7CWLpN2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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