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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4d8adce5db2a162250e24e52f2bbb96b7fbf5f03f907879667748a1cd996b5' 
  AND token = 'bsEzmasn3VaMFa6B+LT5YZcl+9G1z8AruAgxfn44ApY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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