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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5d7863d75ff1b28acc92d67cd8cfc0f7fae55aa660b3039e8d3858c5cd230a' 
  AND token = 'rMDJG6yRVQp0vZuppCVpkMlarY16fwvJm0iGxgUPHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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