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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fb4c476ef07ddba59aa3c13e52590430e8eabfd66e041bbd6a36d7f71b61c1' 
  AND token = 'DCg3NaYOrspaAwizUCLvWlGCutIdRUlOgMjPM9/ssxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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