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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e0813167dba659aece5edf2abdfb60b071f198a8044d54d60ba31149b13d94' 
  AND token = '97L7aEFFah3kGiTaVQ37rIGfch79R//6apa/0T9thco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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