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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e458ed029427151a4d7ae1296b9ead87255f82e2764f2eaafa2e53d24b0738a' 
  AND token = 'ob5GuEW8u44WrQz8qijUjvjVx841OoEvBpbnj84bh2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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