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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd740c3a220f3a01a42ab9c954510dc1093b835de6c9593b45c17cc2414ebea04' 
  AND token = 'VAnmPYM3ITtpJo4B7x2YAgdXddl2Zg47Vsnayw1O1VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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