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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc3f15a85d94329df9f9681f5ed95a7e2a66ea7949683ba57a5ccb7de7c2407' 
  AND token = 'Mx3BhRZaHEsVawsDcfqIxIH30qax664uQ7pWRp5I4hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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