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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59523f5c06cf765d8af73a586fac2e1d7bb74303fc994419496ef939de12a2a9' 
  AND token = 'IViLz45TIxDUE4Fzm+StgYo7ocfkqlwcGFDOky9aVAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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