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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046096c2502e0da6eec1d46e84169b137303e3b8f6601320659417ba89531c1' 
  AND token = 'rdea7N04axJ+1BPXDp1RHRks+F7PGn5wAv2R7TRLYUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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