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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b3a9af4e3d60e39699966b6c9020573717c2f74d3da707d468361ede7e63b6' 
  AND token = 'fqH5sLw9DqykCvh/oPGY6tKN+qqC8bH50aSyZG9tLK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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