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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adcb6feede7956c0ef8d38f815ef4601966921b69e2e2110c12252e91b3f04e' 
  AND token = 'bPjM6HRcdzT+4YxujFCFh+OEtUCLjM4zx7llwAXMyUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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