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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8576ca0928e313ee6c79783d06aea6897d8e8c1c82bb7a289c793e62892d623' 
  AND token = '/q5xq1nbddsSjS/H3nTHoTc2GDX4EfUdI1v3qQehL94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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