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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205730dd892aa4e40bcb72f17af817bb06bfabc6f39f94876a4e98670eb869aa' 
  AND token = '/wASlctxYIP4f8Cm334xCkvsSaChB4i946ZnvE5h9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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