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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b16d57f94633b530b86bc3196ace549b98b5694ddfdbf524abee1e6153748e' 
  AND token = 'Lgq41wW2NahAfVbmieJ2RpXstUad+X62CM/j/zi896k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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