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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032b53c6edd39fe19b94b7e5c0e2291cb3b2f82fb4883eeb71c039cff742504d' 
  AND token = 'TKHacFrbu859JolURnNI+59cfrt/HZ0cfX8+BzVbI2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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