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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3821128f9a17187289bfe29080ae5f5b640ec550ba3e27eea4c1495b28d39a' 
  AND token = 'CujeR50CZZ62RAMvch7MeeujXKeigsn6mXxoO9vekoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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