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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a454526de020c363959bcaadefbcbcf2f1d28e6d59a667d2381795740d810e' 
  AND token = 'vnnhQjvj4oNmv71xjIvR/HDJIO3R3ziCrC7ETW9QNKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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