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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c339fca99de9f42286baa680e759ffc1f653d832b94cc0366db7b317bf6008ba' 
  AND token = 'lblSZlYg7a+2ATKoLSS8rJEMraPV+/VFMkV/HX2PiTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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