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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7fcd05cc01f2583d64b1b0e67d0e21ff67b61147e2446b9a0e7b24df0d9391' 
  AND token = 'Oa4ATat1EX8THpRyN/RQ5tx/hykiUjh2hbNNTkfzUbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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