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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52874852a63668a83f1aad91377d2b9ce3624bfcb2eb8734d81aa7a5cdda66b7' 
  AND token = '20zi7oeSMtQGPiiCmpe5/Lij2TeFSEiC2FSwDy9iXCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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