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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78cb21915e1f638035189e10840b55fbe7aab6ac9fff147ecc591af9a5ab8cd' 
  AND token = 'mqTYunEKEnHSquYGDLYy2nt3g07Eo4Re2/Z8WnMe9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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