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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68684be5d356871b6d00fef4fe911fe10354a4949babb0254decfa366f057d1' 
  AND token = 'MReg9/LiTZ5r3E1mweVuTa6FGLAo4hMn4TNeJLLf6xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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