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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c892afc9a415c390b32b81c8fc32fa12fb3f5ef4d5cb34def78f324875ede73' 
  AND token = 'w9f+BN+o+CFa3L+XNfr41g6mE6XEx5piWs6jjlcDxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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