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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7551304b9bed2a5524a43d4041ecfa925fa68dd67ea048ed9070c3e8d7d4d4d4' 
  AND token = 'O1zzCKz8cmBgA4Y3cvnOAT+r7LPxjjP4vjbiU3QVJpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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