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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11e1a94d94b953da4be6b9b1733dd8b51fa8623e5157c7376e494935518c5d4' 
  AND token = 'z/RdNd3ebnlncfTalsQkInT26Z5Fqw+IsJ1OGxHKTOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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