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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a40a8ab72adb0f3a6a71af5720f2b4b229866d438859dd386bd2583c61684b7' 
  AND token = '2v3Y7LENmjAFnwgqWOIbdnCE62O707aBV/DrIp9vaEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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