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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f035dfba2039fc795bf86a370aea41b10c32affb2aed4e2a96459e3a10ae9999' 
  AND token = 'V+EOxp8DgL3d53Vsx4Z1AUqvUbrFNyERJH5HsQv/oe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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