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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04410c8b0292439a74db57f9b72683ebc582b2f8ad9ac2d73b93895142583c7b' 
  AND token = 'FlxUA41qp99YopFx10/Ij5yrYwKBb9kHihLtOPdYAiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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