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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd2d0b6dc1c9b73d957e25bc43926551142d2e96d7a678bc3b5ef5e4cbc69aa' 
  AND token = 'pNX0ueaO99eYQa2DKTzTcKya85sKFEuodCGgSBRUmJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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