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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd064f0d8f16f148ab02003fda87423d90c1d1c64ef6b521b3b9b3efc7c72c612' 
  AND token = '64RTgYHMIUJer531sFAxjQGeKmPxqWLCHcNeBjC9SpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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