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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7635fce6c83f8fb7091f4c03912c274f90063935e9063e0b343e12c691ac34f' 
  AND token = '4GIYDKcsrByjCFZdNR52Cnih/rswin2eDmAFfD1WZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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