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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63b4877bcaeefde40b5f18c13cacc5aa6fb18eae77d637a7dd71be5a22ca04' 
  AND token = '2usyR14DsCM6tLlj+j4pvpEoxWK/UBHu8a9+8J87WdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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