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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9800eb7af6dfb59a340a82d80b000660929d269fbd2a9552f681051d867e7a15' 
  AND token = 'IUXHnP7r+lY8Ur4rCxcSVKxPPHglYyV+ut3jgy46fus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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