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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd801a8c9a0dd0fe4896e6c2fbb17376f3e24ee9927be8716f991d848561833' 
  AND token = 'fJjOjdH7SvFGWDDZKJb7dTYpoDtSDaUARrX2eb/O0NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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