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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e817b12b18b0e9c98430585b3147035fde741041311b6ae592303e94d70b6987' 
  AND token = '6p8nVBd0ekhgBPRoxuZ6XE2dsz83bDkmmksW6s2cB0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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