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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a260e580787f3da8f80e212a6b84dceacf1728dfc07da057d06926d301e1dc1' 
  AND token = 'fox508RnM3jhTVAGAC4YXKvqyYblJHEZnNFEpOFr4pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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