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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e355f2bccc4509c9294d27ce6d359cfff6b1a201903f06a1677153149b87a8' 
  AND token = 'sI607lzrxktr09B+rSb2+mVJFNporoRlvZsRJ4iFRyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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