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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852c10e3dc8427cc1dd2b4bf51ec94d6606fa6c51f8897df43f73e7c91a2a0db' 
  AND token = '0YUTseUOuxRJuukiM2dvxe4HV+vDU7BbaLTV89Nb5vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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