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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01059dc19427db08b5323ee28ecd866495b59caf906c19202d52f57a49c3d604' 
  AND token = '/JFvKYvHaFPcBSNIeikT8V7tyLEcThQJ/lhYaIuKXX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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