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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd3223ef0a5ec3ca50bd03a02770a2eea82b9086bde5593ceea44ab73e554a1' 
  AND token = '4quEjeC2Ih5hxIo2Z7FXZJoSMnLSXbCsaFPr9EHQIRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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