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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc5cca4997ec097c29b316a4490b9364c2abb47e5505146ed1c8ea008f923e3' 
  AND token = '/7eqAU5WPSxAA6ehu1uccGdPoH4pO/ImM0waTQ8dAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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