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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e773e3fffef51aa9d49884644daf0e087c5cc303d0a22cb569ce3bcaef479f45' 
  AND token = 'nVxBheAQKdgU7/f/au9dTa3oqmhuaJIiJwntq+/vcM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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