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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4504e121d182dd02ad679a2290c43986ab0e52361471deab44189a9db99371e1' 
  AND token = 'fg+hw+G9M/MLaQZh5tuWHm63kxVODUn/h3pEWLMLHSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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