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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3c677dd56a53f7e4b4e50482c7fd4f2d7f3a749f931d9f328451d872c74929' 
  AND token = 'rocwNuB3aRfVhvq5kdNNOG8xW7tvvQEGfgJeS5G9vtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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