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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12472d76575f853c1721d6f9f2814c3b8aa941ea55f269a39c10200a3555490b' 
  AND token = 'WHQN7R0RjpiRhr0CZn3v5dycNcKPrinVxHkOVaUg904=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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