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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30578e7342bd79b6b17ca76e731899f40cc74aab9c84a68689d325d4fb4b0ad9' 
  AND token = '4cr5ErWZE1aJ83Ak6d6TAYb/37bWNYwfhk8mPZ3MSxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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