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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c024a030fc48a2229995ef340f8d02939da34ff6891059194203089e8985590d' 
  AND token = 'Ve2LU2TrLFYSvkXxWlOmF6t4+htypyxlokI+r5SmxLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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