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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125f7add5409589590ada33a3224969cf0ab7c42f7caa4eff67e61b2e3039478' 
  AND token = 'qfHGXK5oKec3U7GL7Yj2Add94amoJ6NmIL1GHyd+Dn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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