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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19690d8f5baa11d3ef6adf746a35b0b19bc82a6cdb3f76590bc12703ff7f1351' 
  AND token = 'XSIO5tyBy8upz/Cn9znsltA17oOAQlfgtmx1dJQ6oaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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