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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01442608db9934d46767d855089cce8df712fca97baa4daadb329b1382e50e6' 
  AND token = '8Q4rcDBzpkvg8ExL0L/g76A7vDz0oau+DeiZs5DMI9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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