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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538f2b2569cf3e1bc6db1003c8677957abeaa372b87037095d50bc36b05bd0e7' 
  AND token = 'FDHzoo44Ee3w1WnjeI8zfH3z3QyzQBxTM9lvWxYl/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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