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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854cdcf086eff29c2b17c580fde0189e9989dc11d4e27f16eef67c0c67a86a95' 
  AND token = 'fqOHG9/FQu6CTl0pb+F2VW4ypSA+BcT5Y23iIROm6Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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