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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fc8e56a5c2a6cba23683b9cee1f6a1bd62e4dec9d63812427a81ba13ae8d52' 
  AND token = 'h9/ZEChYM5SuO/OD+gp08XZk0o4W14NeJmqQInJxbbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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