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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd6ee4ee036dd3badc2499c25fc4bfcdfd8a2c6f7413fe1c3de127b4457f4f2' 
  AND token = 'abaRUmKUA8JVMKwYg44D6bAxcK77VOOE+jrAG93XdPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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