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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bb4a332cacee88b10b1fd71fe326b9abc369d289d8c2245ccb809869198f2a' 
  AND token = 'nxwdf7bSpiodg2YDBw05+K0kcct04rHahPoMyjoL+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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